ZIMBABWE SCHOOL EXAMINATIONS COUNCIL CHEMISTRY 4024/1 - Edunonia

[Pages:12]ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

CHEMISTRY

PAPER 1 Multiple Choice

4024/1

SPECIMEN PAPER1 hour

Additional materials: Mathematical tables and/or electronic calculator Multiple Choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended)

TIME 1 hour

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so. Write your name, Centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.

There are forty questions in this paper. Answer all questions. For each question, there are four possible answers A, B, C and D. Choose the one youconsider correct and record your choice in soft pencil on the separate answer sheet. Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be donein this booklet. A copy of the Periodic Table is printed on page 12.

______________________________________________________________________________ This question paper consists of 12 printed pages.

ZIMSEC

Copyright; Zimbabwe School Examinations Council, Specimen paper.

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2 1 Which process involves a change of state?

A filtration B chromatography C sublimation D diffusion 2 When liquid water changes into steam, the molecules A break up into small particles. B become very large. C move further apart. D give out heat energy. 3 Which apparatus would be most suitable for measuring 16.75 cm3 of a liquid? A a bulb pipette B a burette C a measuring cylinder D a volumetric flask 4 The diagram shows a chromatogram of the dyes present in five different inks.

What is the total number of different dyes inall the five inks? A 3 B 4 C 5 D 11

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5 Which property allows substances to be separated by paper chromatography?

A different solubilities B different colours C equalsolubilities D different boiling points

6 The diagram shows the distillation of a salt solution.

At which point would the temperature be equal to the boiling point of water?

7 Graphite conducts electricity because A it contains electrons that are free to move. B it contains protons that are free to move. C the layers of atoms can slide over each other. D it contains impurities.

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8 Elements are systematically arranged in the Periodic Table in the order of increasing

A nucleon number. B proton number. C valency number. D number of neutrons.

9 Which pair of atoms has the same number of neutrons?

A

15 7

N

and

14 7

N

B

2131Na

and

23 12

Mg

C

14 6

C

and168O

D

29325 U

and

238 92

U

10 The structure of an atom is shown.

Which statement about this atom is correct?

A It is not a neutral atom. B Its nucleon number is 13. C It has 4 valency electrons. D It forms ions of a charge of +2.

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11 Theelement francium, Fr, is in the same group of the Periodic table as potassium. The formula of francium chloride is likely to be

A

Fr2Cl

B

Fr Cl

C Fr Cl2

D Fr Cl3

12 The proton number of element X is 19. When X forms an ionic compound, the electronic structure of the ion formed by X is

A 2, 8, 8. B 2, 8, 8, 1. C 2, 8, 8, 2. D 2, 8, 8, 3.

13 Which equation is balanced?

A

CO + O2 ? CO2

B

2CO + 2O2 ? 2CO2

C

CO+ O2 ? 2CO2

D

2CO+ O2 ? 2CO2

14 The structural formula of butanedioic acid is shown.

Which statement about butanedioic acid is not true?

A Its molecular formula is C4H6O4 .

B It contains 3 types of elements. C Its molecular and empirical formulae are the same. D One molecule contains 14 atoms.

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15 What is the ionic equation for the reaction between sodium hydroxide and hydrochloric acid?

A

2 H(+aq) + OH(-aq) ? H2O(l)

B

H(+aq) + OH(-aq) ? H2O(l)

C

Na(+aq) + Cl(-aq) ? NaCl2(aq)

D

H(+aq) + Cl(-aq) ? HCl2(aq)

16 A compound contains 33.3% carbon and 66.7% oxygen.

The empirical formula of the compound is

A

CO2 .

B

C2O3 .

C

C3O2 .

D CO3.

17 Sodium hydrogen carbonate decomposes on heating as shown

2 NaHCO3 ? Na2CO3(s)+ H2O(l)+ CO2(g)

What is the volume of gas produced at r.t.p, from the decomposition of 4 moles of sodium hydrogen carbonate?

A 22.40 dm3 B 28.00 dm3 C 44.80 dm3 D 56.00 dm3

18 What is the number of chlorine molecules in 35.5 g of chlorine gasif the number of molecules in one mole of a gas is x. ?

A 0.5 x B x C 2x D 35.5x

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19 A chloride ion, Cl-, has the same number of electrons as

A Br- .

B F.

C Ar.

D

O2- .

20 During electrolysis, cations move towards the

A cathode. B anode. C electrolyte. D battery.

21 An object is electroplated with copper.

Which statement about the process is correct?

A The concentration of copper ions in the electrolyte increases. B Copper is used as the cathode. C Copper ions gain electrons from the object being electroplated. D Oxygen is evolved at the anode.

22 Which reaction takes place when a photographic film is exposed to light?

A 2 Ag+ Br2 ? 2 AgBr

B

Ag++ e- ? Ag

C

Br2+ 2 e- ? 2 Br-

D

Ag+ + Br- ? AgBr

23 In the equilibrium reaction N2 + 3H2 2 NH3, whichsubstance(s)

will be present in the equilibrium mixture?

A

NH3 only

B

N2, H2 and NH3

C

N2 and H2 only

D

H2 only

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24 Which row correctly gives the correct number of protons, neutrons and electrons of the ion.

ion protons neutrons electrons

A

9 4

Be2+

4

5

4

B

F 19 -

9

9

10

10

C

27 13

A

l

3+

13

14

13

D

35 17

C

l-

17

18

16

25 A solution of an alkali in water

A has a pH less than 7. B turns blue litmus paper red. C contains hydroxide ions. D neutralises a salt to produce an acid.

26 What is the oxidation state of nitrogen in N2O3?

A +6

B +3

C -3 D -2

27 Which element is always found in steel?

A carbon B chromium C nickel D silicon

28 Brass is an alloy of

A lead and tin. B zinc and copper. C iron and carbon. D iron and aluminium.

29 Molten cryolite, Na3AlF6, is used in the extraction of aluminium because

A it lowers the melting point of aluminium oxide. B it dissolves the aluminium oxide. C it increases the melting point of aluminium oxide. D it increases the purity of aluminium.

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